Aprons are for performing household chores and servants. Having your submissive husband or boyfriend wear an apron will help him be mindful of his role as a woman’s domestic servant.
And it keeps his unseemly genitals out of view.
Ideally of course submissive husbands should be nude except for their apron. You don’t want blows to his buttocks blunted. But pink panties will not interfere with his punishment and a little sissification will help keep him humble.
To heighten the submissive male’s humility his Mistress may invite her girlfriends to watch him perform his chores. While not strictly CFNM the hapless male will feel the same sense of humiliation.